Vibrationproof lamp



,May l0, 1938. G. HERZBERG VIBRATIONPROOF LAMP Filed Aug. 28, 1935 JN VEN TOR.

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A TTORNEY Patented May l0, 1938 l UNITED STATES anu-1s mmm IP Gdav Bmg, WEI., adgncr-to AtlasSpedaltyOmaecpel-aondltewler ley Y swims.. am es, ms, sem No. :aus

4CIai-a Ihisinventionrelatestolampandisdirected totheartofelectricincandescentlamps. Inits morespecincaspecttheinventionisdirectedto anoveltypeof electric 5 turethat-flndsparticularutilityinfactoriesand thelikewheretheelectrielightingunitsaresub-r jected to a large number of vibrations per minute over periods of many hours whether the lihting units be energized or de-.

It has heretofore been appreciated that when lampsareusedinfactorlesorotherplaceswhere scwingmachines,electricmotorsandthelikeare inoperationthatthelampsaresubjectedtovibration. The vibrations per minute of the lamp l5maysometimesbeashighasthreethousand.

Became of these vibrations which ordinarily are neither visible nor felt, incandescent electric lamps subject to these vibrations have had a comparativeLv short life. In order to provide a zo lamp having a longer life when in such use it has been proposed to extend the leading-in conductors a considerable distance beyond the filament at the point of weld, and to weight the ends of the leading-in conductors. This con- 26 struction serves to lower the amplitude of vibration at the points of engagement of the leadingin conductors and the filament. Another type of construction proposed is to employ a metallic support intermediate the glass arbor and the 30 press so that the entire interior metallic estructure shall vibrate as a imit. In the course of my observations of lamps of this type that have been subjected to vibration, Ivhave not found them to be a real solution.

In consequence thereof I have developed a novel lamp, hereinafter described which may be manuiactured at a reasonable cost and which when employed as lighting units in places where it is subjected to a large number of vibrations per n minute, it has a relatively long life when compared with the life of said other lamps in similar use.

An object of my invention is to provide an 5 electric incandescent lamp especially adapted to be employed in those places where it will be subjected to a large number of vibrations per minute.

Another object of my invention is to provide a novel vibration resistant incandescent lamp having a reasonably long life.

These and other objects of my invention will be readily apparent from the following description and appended drawing, wherein Figure 1 represents an elevation of an incandescent lamp embodying'my invention.

(G. PIB-39) Figure 2 represents an elevation at right angles to that of Figure 1.

Figure 3 represents a plan view of a spacer element of my invention. A

As shown in the drawing, the incandescent 5 lamp a vitreous bulb Il integral with a vitreous reentrant stern I I. 'Ihe upper portion orwhatItermthefree end ofthe stem il isin the form of a`pinch or press I2 in which are embedded a pair of spaced leading-in conductors I3. l0 AV pair of supporting and leading-in conductors Ilaresealedinthepressandareconnectedto the conductors Il.

Integral with said press and extending therevfrom is a glass arbor or rod Il having the extreme outer part of its free end in the form of a button II whose diameter is about two or three times that of the arbor Il. The free end of the arbor Il is the outer portion thereof which is remote from press l2 and includes button i6. The vglass arbor l5 extends along the longitudinal center line of the bulb Il and the conductors Il are parallel to each other, and are bent away from the glass arbor I5 and are in a plane which does not include the arbor li.

A coiled tungsten filament I1 of the Iring type is located in a plane located a material distance away from the button Ii and has its ends welded to and/or clamped to the supports il. Clamping of the ends of the lament may be accomplished by bending over a small portion of the outer ends of the supports Il on themselves with the filament ends therebetween and pressing together under pressure the upper portions of the -body of the supports, said outer ends and the 35 filament ends therebetween. Equally spaced around about of the button i6 and securely embedded therein are anchor wires il, I! and 20 which extend both laterally and vertically away from the button I6. These anchor or lament support wires are of much smaller diameter than the corresponding dimension of the supports Il and their outer ends may be in the form of loops wrapped around the illament I1 to maintain the same in position. Instead of wrapping or loop- 45 ing these thin support wires around the nlament, they may be welded thereto, as shown, or welded and also looped or wrapped. The points of connection between the ilament il and wires IB,

I9 and 2l are about 30 apart.

In accordance with my invention I have found that best results are obtained wit-h a lamp that is to be subjected to a great deal of vibration by having the lament and supporting conductors as a unitary structure so that there shall be sub Il stantially no vibration between the nlament and supports and especially at those points between these elements where-they are joinedv together by welding. Therefore, I have provided a pair of relatively thin anchor wires 2| which are Vembedded in the button I5. 'I'hese wires are spaced about 60 apart and each wire is about 60' from the anchor wire closest thereto. These two wires 2i extend outwardly from the button l5 and are in a plane substantially/parallel to the plane of the nlament i1. The other ends. of these anchors v2| are looped around and/or welded to the supports Il.

Instead of employing anchor wires 2|, I may employ an anchor means ofthe type illustrated in Figure 3. The novel anchor means may be greater than the corresponding dimension of 4arbor |5, I prefer thatit be equal to or less than the diameter 'of arbor Il, so that there shall be a snug it between the anchor means and arbor when assembled. Because the diameter of the 'arbor l5 is not constant throughout its length 4and because the diameter of the arbors i5 employed in production are not exactly the same I provide a plurality of radial slits 26 in the portion 22. These slits extend outwardly from the circumference of said opening 25.

When the slits are employed, I prefer'that the diameter of the opening 25 shall be materially smaller than the diameter of the arbor I5. The length of the slits 25v may be such that the button I5 may be projected through the opening 25 even when the diameter of this opening is materially less than that of arbor I5.

An opening 21 is located at the outer portion of each arm 22 and its diameter may be greater,- slightly less than or equal to the diameter of the supports I4. If desired the diameterof openings 21 may be materially less than the corresponding dimension of supports I4, and a plurality of spaced radial slits 28 may extend outwardly from the circumference of said openings.

The anchor means may be assembled with the supports I4 and arbor I5, by simultaneously sliding the arbor l5 and the supports il through the respective openings 25 and'21. When` these openings have a diameter materially less than the diameters of the arbor i5 and the supports I4, the slitted portions of the anchor means delining4 the openings 25 and 21 are flexed and bent so as to form a snug and tight ilt between arbor I5, supports Il and the anchor means.

Slits or narrow slots 25' mayextend from the outer extremity of the arms 25 and into the openings 25. A slot or narrow slit 20 may be located in the enlarged portion 22 and may extend from the inner apex of the anchor means and into the opening 25. Although these slits or slots may bestraight, I prefer that they be curvilinear as shown.

A further modification of an anchor means is a thin rigid glass element having the same gen- .eral exterior form as the anchor or spacer shown in Figure 3. This element may be fused directly to the arbor i5 and this element which may replace the button will have the anchor wires i8,

il and 20 embedded in the enlarged portion 22 tnerecf and the supports u my be embedded intheouterendsoftheglassarms.

When led the spacers or anchor means are located at the upper end of the arbor and the outer ends of arms 28 frictionally engage the supports Il at the upper portions thereof and preferably at points directly opposite the button il.withthespacerbeinginaplaneparallelto the filament i1.

Lamps constructed in accordance with the teachings as above set forth have actually been employed in the neld' and have been found to be entirely satisfactory. I believe that 4the reason for the satisfaction rendered by lamps embodying my invention has been due to the fact that the lamp is vibration resistant and therefore vibrationproof. That is, there is very little, if

`\any, cantilever beam action between the enclosed parts of the lamp during vibration of the socket and envelope.

Although my invention has been described with minute particularity, it is to be limited only by the prior art.

What isclaimedis: v 4

l. A vibrationproof lamp comprising a vitreous envelope, a reentrant stem having a press, a plurality of supporting conductors embedded in said press, a vitreous arbor integral with said press and extending a material distance therefrom, a filament, avplurality of anchors carried by said arbor and secured to said nlament, a

rigid mica spacer carried bysaid arbor at the a free end thereof remote from said press and connected to said supporting conductors to prevent vibration of said supporting conductors.

2. A vibrationproof lamp comprising a vitreous envelope, a reentrant stem having a press, a pair of supporting conductors embedded in said press; a vitreous arbor integral with said press and extending upwardly therefrom, a rigid mica spacer, said spacer having three openings thereirr, said spacer being located at the free end of said arbor, with the arborextending throughone of saidl openings and the supporting conductors extending through the other two of said openings to reduce vibration of said supporting conductors.

3. A vibrationproof lamp comprising a vitreous envelope, a reentrant stem having a press, a plurality of supports embedded in said press, a vitreous arbor integral with said press and extending upwardly therefrom, a filament connected to said supports, a mica spacer having an opening therein, said arbor extending through said opening, the diameter of said opening being less than the diameter of said arbor, said spacer having two other openings, said supports extending through these openings, said spacer being located at the upper end of said arbor, slits extending outwardly from the circumference of one of said openings.

4. A vibrationproof lamp comprising a vitreous envelope, a reentrant stem having a press, a plurality of supports embedded in said press, a vitreous arbor integral with said stem, a ring type filament secured to said supports, a spacer having openings therein, short slits extending outwardly from the circumference of one of said openings and terminating within the perimeter of said spacer, a slit extending from the perimeter of said spacer to the circumference of one of said openings; said spacer being located close to the upper extremity of saidarbor and said supports extending through said spacer.

GUSTAV :m- A: or e 

